deepseek.com

https://www.deepseek.com/

Ranks Overall #1,501 Developer Tooling #87 AI #8

Data from Sep 14, 2026, 6:15 AM UTC 25h old Measured every 2 days · 9 runs since Aug 31, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Scoring Calculator · Wayback Machine

This URL redirects to https://www.deepseek.com/en/.

The site’s front door pointing at the page it serves there — a locale or CMS landing path, not a move. The origin is still the address of the site, so history stays under it rather than forking to a path that depends on where the measurement ran. Lighthouse follows the redirect, so the numbers below describe the page actually served; the only cost is an extra hop on each run.

Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).

Stack

Built with Next.js

Uses React

Hosted by Amazon S3

Filmstrip LAB Throttled

How the page drew during the measured load, at 9 points across 18.99 s. Compare this filmstrip against another site.

2.37 s
4.32 s
4.93 s
7.12 s
9.50 s
11.87 s
14.24 s
16.62 s
18.99 s

Lighthouse Scores LAB Simulated

Performance

↑ +1 (+2.3%)

Accessibility

no change

Best Practices

no change

SEO

no change

Metrics LAB FIELD

Core Web Vitals: passing 3 of 3 assessed from real Chrome users.

Field figures are the p75 across real Chrome users over a 28-day trailing window (2026-08-15 → 2026-09-11), url-level.

Metric	Lab Simulated	Field
LCP CWV Largest Contentful Paint	6.83 s poor	↑ +46 ms (+0.7%) 4.37 s – 7.40 s	1.73 s good	89.5% 7.1% 3.4%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	107 ms good	92.9% 6.7% 0.4%
CLS CWV Cumulative Layout Shift	0 good	→ no change 0 – 0	0 good	99.7% 0% 0.3%
TBT Total Blocking Time	9.34 s poor	↑ +240 ms (+2.6%) 245 ms – 9.34 s	n/a	—
FCP First Contentful Paint	1.35 s good	↓ -151 ms (-10%) significant 1.35 s – 1.51 s	1.46 s good	84% 10.2% 5.8%
Speed Index	4.63 s needs work	↑ +35 ms (+0.8%) 2.54 s – 6.04 s	n/a	—
TTFB Time to First Byte	603 ms good	→ no change 603 ms – 613 ms	783 ms good	75.7% 16.3% 8%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

6.83 s poor

↑ +46 ms (+0.7%) 4.37 s – 7.40 s

1.73 s good

89.5% 7.1% 3.4%

INP CWV Interaction to Next Paint — field only, no lab run can measure it

n/a

—

107 ms good

92.9% 6.7% 0.4%

CLS CWV Cumulative Layout Shift

0 good

→ no change 0 – 0

0 good

99.7% 0% 0.3%

TBT Total Blocking Time

9.34 s poor

↑ +240 ms (+2.6%) 245 ms – 9.34 s

n/a

—

FCP First Contentful Paint

1.35 s good

↓ -151 ms (-10%) significant 1.35 s – 1.51 s

1.46 s good

84% 10.2% 5.8%

Speed Index

4.63 s needs work

↑ +35 ms (+0.8%) 2.54 s – 6.04 s

n/a

—

TTFB Time to First Byte

603 ms good

→ no change 603 ms – 613 ms

783 ms good

75.7% 16.3% 8%

LCP LAB Simulated vs LCP FIELD

Lab 6.83 s

Field p75 1.73 s

The lab LCP is 3.95× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	813 kB	↑ +10.9 kB (+1.4%) 716 kB – 816 kB
Requests	65	→ no change 58 – 70
Third-party Weight	0 B	→ no change 0 B – 0 B
Third-party CPU	0 ms	→ no change 0 ms – 0 ms
Unused JS	281 kB	↑ +5.6 kB (+2.1%) 250 kB – 306 kB
Unused CSS	0 B	→ no change 0 B – 0 B

Metric

Value

Change / range

Trend

Page Weight

813 kB

↑ +10.9 kB (+1.4%) 716 kB – 816 kB

Requests

→ no change 58 – 70

Third-party Weight

0 B

→ no change 0 B – 0 B

Third-party CPU

0 ms

→ no change 0 ms – 0 ms

Unused JS

281 kB

↑ +5.6 kB (+2.1%) 250 kB – 306 kB

Unused CSS

0 B

→ no change 0 B – 0 B

By resource type

Type	Share	Size	Requests
script	56.6%	341 kB	33
image	19.6%	118 kB	6
font	10.5%	63.1 kB	4
document	7.8%	47.0 kB	2
other	2.8%	17.1 kB	13
stylesheet	2.8%	16.6 kB	6
Total		813 kB	65

Without JavaScript

This page is client rendered.

Nothing was painted until the scripts ran. This is a web performance and robustness issue!

The same load, photographed twice at 412×823: once with scripts disabled, once as rendered.

66% of pixels differ — the page changes substantially. A shifted layout counts as difference, so a <noscript> banner alone can account for a large figure.

Page health

Metric	Value	Change / range
Main Thread Work	13.88 s	↑ +311 ms (+2.3%) 2.44 s – 16.79 s
Long Tasks	20	→ no change 5 – 20
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)	10	→ no change 6 – 10
A11y Failures	3	→ no change 3 – 4
A11y Failing Nodes	8	→ no change 6 – 8

Metric

Value

Change / range

Trend

Main Thread Work

13.88 s

↑ +311 ms (+2.3%) 2.44 s – 16.79 s

Long Tasks

→ no change 5 – 20

Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)

→ no change 6 – 10

A11y Failures

→ no change 3 – 4

A11y Failing Nodes

→ no change 6 – 8

Main thread work

Task	Share	Duration Simulated
other	90%	12.50 s
script evaluation	6%	817 ms
script parse compile	2%	271 ms
style layout	1%	195 ms
paint composite render	0%	45 ms
parse HTML	0%	33 ms
garbage collection	0%	18 ms
Total		13.88 s

Task

Time

Duration Simulated

other

90%

12.50 s

script evaluation

817 ms

script parse compile

271 ms

style layout

195 ms

paint composite render

45 ms

parse HTML

33 ms

garbage collection

18 ms

Total

13.88 s

Axe violations axe-core 4.13.0, full rule set

10 violating nodes across 4 rules, 344 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

critical button-name — Buttons must have discernible text 5 nodes
serious link-name — Links must have discernible text 2 nodes
moderate region — All page content should be contained by landmarks 2 nodes
serious aria-prohibited-attr — Elements must only use permitted ARIA attributes 1 node

Accessibility failures 3 of 25 audits

button-name — Buttons do not have an accessible name 5 nodes
link-name — Links do not have a discernible name 2 nodes
aria-prohibited-attr — Elements use prohibited ARIA attributes 1 node

Best Practices failures 1 of 19 audits

deprecations — Uses deprecated APIs 1 item

SEO failures 1 of 10 audits

link-text — Links do not have descriptive text 1 item

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Field history 25 weeks

Weekly p75 from the CrUX History API, backfilled in a single request.

Week ending	LCP	INP	FCP	TTFB
2026-09-05	1.69 s	132 ms	1.66 s	769 ms
2026-08-29	1.72 s	140 ms	1.70 s	754 ms
2026-08-22	1.74 s	143 ms	1.73 s	741 ms
2026-08-15	1.76 s	144 ms	1.75 s	721 ms
2026-08-08	1.78 s	145 ms	1.76 s	724 ms
2026-08-01	1.79 s	145 ms	1.78 s	730 ms
2026-07-25	1.82 s	146 ms	1.80 s	740 ms
2026-07-18	1.84 s	146 ms	1.80 s	758 ms
2026-07-11	1.87 s	146 ms	1.80 s	772 ms
2026-07-04	1.89 s	147 ms	1.79 s	781 ms
2026-06-27	1.90 s	148 ms	1.77 s	779 ms
2026-06-20	1.88 s	146 ms	1.75 s	765 ms

Week ending

LCP

INP

CLS

FCP

TTFB

2026-09-05

1.69 s

132 ms

1.66 s

769 ms

2026-08-29

1.72 s

140 ms

1.70 s

754 ms

2026-08-22

1.74 s

143 ms

1.73 s

741 ms

2026-08-15

1.76 s

144 ms

1.75 s

721 ms

2026-08-08

1.78 s

145 ms

1.76 s

724 ms

2026-08-01

1.79 s

145 ms

1.78 s

730 ms

2026-07-25

1.82 s

146 ms

1.80 s

740 ms

2026-07-18

1.84 s

146 ms

1.80 s

758 ms

2026-07-11

1.87 s

146 ms

1.80 s

772 ms

2026-07-04

1.89 s

147 ms

1.79 s

781 ms

2026-06-27

1.90 s

148 ms

1.77 s

779 ms

2026-06-20

1.88 s

146 ms

1.75 s

765 ms

Runs

Every stored run for this URL, newest first.

When	Perf	LCP	TBT	Weight	Runs	Spread	Bench	Took	Archive
Sep 14, 2026, 6:15 AM UTC	44	6.83 s	9.34 s	813 kB	3/3	±8	2,546 +3%	182.4s	Wayback
Sep 11, 2026, 11:20 PM UTC	43	6.79 s	9.10 s	802 kB	3/3	±8	2,457 -1%	182.2s	Wayback
Sep 9, 2026, 8:28 PM UTC	40	7.40 s	9.17 s	816 kB	3/3	±8	2,189 -12%	40.9s	Wayback
Sep 7, 2026, 7:02 PM UTC	43	7.38 s	8.70 s	802 kB	3/3	±9	2,345 -6%	38.7s	Wayback
Sep 5, 2026, 12:31 PM UTC	44	6.83 s	9.14 s	810 kB	3/3	±8	2,207 -11%	39.3s	Wayback
Sep 4, 2026, 1:07 AM UTC	70	5.31 s	384 ms	730 kB	3/3	±9	2,344 -6%	35.7s	Wayback
Sep 2, 2026, 11:17 PM UTC	79	4.43 s	245 ms	716 kB	3/3	±17	3,002 +21%	31.7s	Wayback
Sep 1, 2026, 10:56 PM UTC	74	4.37 s	413 ms	730 kB	3/3	±17	2,345 -6%	34.3s	Wayback
Aug 31, 2026, 9:09 PM UTC	70	5.29 s	406 ms	739 kB	3/3	±18	2,350 -5%	36.3s	Wayback

When

Scores

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Stack

Filmstrip LAB 🐢 Throttled

Lighthouse Scores LAB 🤖 Simulated

Metrics LAB FIELD

LCP LAB 🤖 Simulated vs LCP FIELD

Page weight

By resource type

Without JavaScript

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

Accessibility failures 3 of 25 audits

Best Practices failures 1 of 19 audits

SEO failures 1 of 10 audits

Hygiene

Measurement log

Field history 25 weeks

Runs

Filmstrip LAB Throttled

Lighthouse Scores LAB Simulated

LCP LAB Simulated vs LCP FIELD